Flame hardening apparatus



July 1, 1941- A. L HARTLEY 2247.494

` FLAME HARDENING APPARATUS Filed June 1s, 1940 3 sheets-sushi 1 l INVENTOR. ALBERT L.HARTL.ET

` BY www* July 11, 19541 A. u. HARTLEY FLAME HARDENING APPARATUS Filed June 18, 1940 3 Sheets-Sheet 2 Smau INVENTOR I ALBERT L. HARTLEY July 1, 1941. A, L HARTLEY 2,247,494

FLAME HIARDENING APPARATUS F'led J une 18.- l 3 Sheets-Sheet 3 o nl I I I l l n l I 1 'F I /ln g:

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Patented July 1, 1941 2,247,494 A FLAME nAnDENmG 'APPARATUS Albert L. Hartley, cincinnati, ohio, assignmto The R. K. Le Blond Machine Tool Company, Cincinnati, Ohio, a corporation of Delaware Application June 1s, 1940, serial No. 341,174

2 Claims.

This invention pertains to flame hardening apparatus and is particularly related to certain types of flame hardening burners which are used for flame hardening the faces or ends of work pieces and also internal -bore portions of work pieces when rotated in front of a circular jetted arrangement of the burner. This flame hardening burner is particularly adapted to use when hardening such work pieces which are'to be subsequently quenched by emersion in a coolant or which may becooled immediately after the application of the iiame to bring it to the proper hardening temperature.v

More especially the object of this invention is to provide asimplified type of [burner which is economical of manufacture and which is very versatile in so far as easy adaptation is concerned to applying it to a large variety of .spot or face hardening of work. v

Another object of this invention is to provide a burner body and a clamping shell which may .be used to hold different types of cylindrical circular flame jet tips which-may be easily manufactured and which may be readily accommodated to a large variety of work to be ame hardened While being rotated in the presence of the harden.- ing ame.

lFurther features and advantages of this invention will appear from the detailed description Figure I is a transverse section through a typical name hardening burner assembly arranged for hardening the teeth on the end of a clutch sleeve when rotated in front of the hardening `flame, the work piece then -being dropped into a quenchingl medium promptly after being heated by said burner.

Figure H is a front view of the burner shown in Figure I on the line II-II thereof particularly showing the circular arrangement of the iiame jets in the cylindrical burner tip.

Figure III isI a vertical, transverse sectionthrough the burner tip in Figure I shown on the line III-III of Figure IV showing a modication adapted to heating internal surfaces in a bore of a work piece as illustrated inF'igure V.

Figure. IV is a. front end view of the burner tip, particularly showing the arrangement of the flame jets and the gas escape passageways or slots in the-periphery of the burner tip.

Figure V is an assembly view in section on the line V-V of Figure IV, showing a specific application of the burner of Figures III and IV to the hardening of an internal surface in a. bore (Cl. 15S-27.41)

when used in conjunction with a conventional rotary flame hardening machine.

Referring particularly to Figures I and II, the burner body l is provided with the usual threaded connecting end 2 for mounting on a conventional oxyacetylene blow pipe (not shown) which de` which enters the annular slot 8 and from which l is iiows to the passageways 9 and it to the chamber ll formed by the'clamping ring l2 which is journaled about the bearing portion i3 of thel burner body l and has an internal abutment surface la which engages the surface i5 of the burner body l and has an outer threaded bore It adapted to engage the threaded portion 'Ill of the burner tip t so that when it is rotated in proper direction, it will securely hold the burner tip t in 'uid tight engagement at the point IIB with the burner ibody l and will also form a fluid tight seal therebetween and at the point between the surfaces it and l5 and the threaded portions-i6 and il so that the chamber lll will ,be fluid tight and so that the chamberformed by the counterbores d and 5 will be gas tight for l proper delivery of the combustible fuel for the flame jets l. 'I'he chamber ll is supplied by cooling iluid issuing from the passageways 9 and Ill and is' exhausted through the outlet opening through a suitable pipe line IIS and is circulated through the chamber Il, so as to properly keep the clamping ring l2 and the burner lbody l cool to prevent warpage and distortion therein during the'excessive heat developed by the .flame jets -l as they impinge upon the work piece 'W when it is being rotated in front of it.

This burner. is capable of quick changeover for a large variety of diameters of rotating work f- `to be flame hardened. It is obvious that this can be done with this unique construction merely by substituting various cylindrical burner tips 6 having different circular diameter arrangements of flame jets 'l anywhere within the range of the diameter of the tip piece 6.

For example, a. further variation of this type of burner arrangement is shown in Figures III and IV in which the burner tip Gais arranged for relatively large diameter work and also for hardening an annular surface while it is being rotated and which is located inside of a bore in a work piece as is shown in Figure V. In this case the burner tip 6a is provided with passageways 20 from which extend the flame jets 2| arranged in a relatively large diameter circle as shown in Figure IV. In between these jets are cut away portions 22 formed in the burner tip 6a so that as it is moved into the threaded bore 23, Figure V, of a clamping ring collar 24, the

burned fuel which escapes from the flame jets 2|v '28 is rotated, the surface25 will be rotated in front of the flame jets 2| for the proper and thorough heating of this surface of the work piece.

During the operation of the apparatus shown in Figure V, While the spindle 28 is rotating the flames from the jets 2| are constantly being played on surface 25 so as to bring it up to hardening temperature. Meanwhile, coolant fluid is applied to the chamber to at all times keep the burner body I and clamping ring I2 `properly cooled. As soon as the surface 25 has been properly heated, the burner is withdrawn to' the right as shown in Figure V and a stream of quenching fluid from the line 29 passes into 'the quenching fluid distributing block 3D out through the radially extendingpassageways 3| where it impinges upon the heated surface 25 quenching it properly to effect the proper hardening of this vparticular surface on' the work. The work is then ready to be removed from the rotating xture 26 by moving the distributing line adapted to hardening surfaces inside of bores of work pieces lwith equal facility. A

Having thus fully set forth and described my invention what I claim as new and desire to secure by United States Letters Patent:

1. A flame hardening burner comprising, a circular burner body, a circular clamping ring surrounding said body, a circular burner tip adapted to be held on said burner body by said clamping ring, said clamping ring and said burner tip forming a coolant chamber around said burner body when said tip is held on said body by said clamping ring. l

2. A ame hardening burner comprising, a circular burner body, means formed on said body for attaching itto a flame hardening blowpipe, a counterbore formed in said body, a fuel passageway in said body communicating with said blowpipe opening into said counterbore a circular disc-like member for forming the burner tip adapted to be mounted over said counterbore on said body to form a closed fuel distributing chamber, flame jet orifices formed in said disc-like member communicatingwith said fuel distributing chamber, -a circular clamping ring surrounding said body adapted to hold said burner tip on said body, said clamping ring and said burner tip forming a coolant chamber around said burner body when said tip is held on said body by said clamping ring, a coolant passageway in said body communicating with said blow pipe and opening into-said chamber, and acoolant discharge pa'ssageway in said clamping ring opening into said chamber.

ALBERT L; HARTLEY. 

